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Publication type: Journal Article
Document type: Full Paper

Year: 2002

Author(s): Koschier, E; Sedy, KA; Novak, J

Title: Influence of plant volatiles on feeding damage caused by the onion thrips Thrips tabaci.

Source: Crop Protection (21) 419-425.

Authors Vetmeduni Vienna:

Novak Johannes

Vetmed Research Units
Institute of Animal Nutrition and Functional Plant Compounds

Leaf disc bioassays were conducted to determine the effects of essential oils and their volatile constituents from plant species (Lamiaceae family) at three concentrations ranging from 0.01% to 1% on the feeding activity of adult female onion thrips (Thrips tabaci Lindeman; Thysanoptera: Thripidae). The percentage of feeding damage area on leek (Allium porrum L.) leaf discs and the adult survival was assessed after 24 h. Onion thrips were significantly deterred by the essential oils of marjoram (Origanum majorana L.), lavender (Lavandula angustifolia L.) and mint (Mentha arvensis L.) at several concentrations, and by the oil of rosemary (Rosmarinus officinalis L.) at 1% concentration. Furthermore, thrips feeding damage was reduced as a result of linalool and eugenol application at three concentrations. Adult survival on the leaf disc surface was significantly decreased by application of terpinen-4-ol at 1% concentration. Evaluation of the potential of biologically active plant volatiles against T. tabaci may provide a new approach to the development of antifeedants and/or natural insecticides for use in both biological and integrated pest management strategies. (C) 2002 Elsevier Science Ltd. All rights reserved.

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